v3.26.1
Foreign Activities (Analysis of Certain Asset and Liability Accounts Related to Foreign Activities) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Foreign Activities Disclosure [Line Items]      
Cash and due from banks ¥ 4,366,847 ¥ 4,591,186  
Interest-earning deposits in other banks 86,003,138 104,706,928  
Total 90,369,985 109,298,114 ¥ 110,118,623
Trading account assets 83,921,911 59,417,128  
Investment securities 53,819,507 58,318,547  
Loans—net of unearned income, unamortized premiums and deferred loan fees 144,819,224 131,438,515  
Deposits 260,755,340 249,415,006  
Funds borrowed:      
Call money, funds purchased 5,257,237 5,016,678  
Payables under repurchase agreements 39,516,053 43,663,859  
Payables under securities lending transactions 1,252,146 718,451  
Other short-term borrowings 12,859,910 24,636,926  
Long-term debt 21,884,349 21,022,407  
Trading account liabilities 41,104,659 21,502,912  
Foreign      
Foreign Activities Disclosure [Line Items]      
Cash and due from banks 820,940 786,831  
Interest-earning deposits in other banks 16,926,174 12,055,034  
Total 17,747,114 12,841,865  
Trading account assets 42,593,213 36,473,239  
Investment securities 13,835,608 12,773,480  
Loans—net of unearned income, unamortized premiums and deferred loan fees 67,245,022 56,713,215  
Deposits 69,774,657 65,410,708  
Funds borrowed:      
Call money, funds purchased 53,215 155,975  
Payables under repurchase agreements 15,473,811 16,039,173  
Payables under securities lending transactions 30,653 32,194  
Other short-term borrowings 7,905,018 6,941,877  
Long-term debt 2,015,345 1,864,473  
Total 25,478,042 25,033,692  
Trading account liabilities ¥ 9,682,798 ¥ 8,026,912